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Triaxial modeling of halo density profiles with high-resolution N-body simulations
文献类型：期刊论文
| 作者 | Jing, YP; Suto, Y |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2002-08-01 |
| 卷号 | 574期号:2页码:538-553 |
| ISSN号 | 0004-637X |
| 关键词 | Cosmology : Theory Dark Matter Galaxies : Clusters : General Galaxies : Halos Methods : Numerical |
| 英文摘要 | We present a detailed nonspherical modeling of dark matter halos on the basis of a combined analysis of high-resolution halo simulations (12 halos with N similar to 10(6) particles within their virial radius) and large cosmological simulations (five realizations with N = 512(3) particles in a 100 h(-1) Mpc box size). The density profiles of those simulated halos are well approximated by a sequence of the concentric triaxial distribution with their axis directions being fairly aligned. We characterize the triaxial model quantitatively by generalizing the universal density pro le, that has previously been discussed only in the framework of the spherical model. We obtain a series of practically useful fitting formulae in applying the triaxial model: the mass and redshift dependence of the axis ratio, the mean of the concentration parameter, and the probability distribution functions of the axis ratio and the concentration parameter. These accurate fitting formulae form a complete description of the triaxial density profiles of halos in cold dark matter models. Our current description of the dark halos will be particularly useful in predicting a variety of nonsphericity effects, to a reasonably reliable degree, including the weak and strong lens statistics, the orbital evolution of galactic satellites and triaxiality of galactic halos, and the nonlinear clustering of dark matter. In addition, this provides a useful framework for the nonspherical modeling of the intracluster gas, which is crucial in discussing the gas and temperature profiles of X-ray clusters and the Hubble constant estimated via the Sunyaev-Zeldovich effect. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | UNIV CHICAGO PRESS |
| WOS记录号 | WOS:000177270400002 |
| 源URL | [http://119.78.226.72/handle/331011/32435]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Jing, YP |
| 作者单位 | 1.Univ Tokyo, Res Ctr Early Universe, Sch Sci, Tokyo 1130033, Japan 2.Univ Tokyo, Dept Phys, Sch Sci, Tokyo 1130033, Japan 3.Max Planck Inst Astrophys, Partner Grp, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jing, YP,Suto, Y. Triaxial modeling of halo density profiles with high-resolution N-body simulations[J]. ASTROPHYSICAL JOURNAL,2002,574(2):538-553. |
| APA | Jing, YP,&Suto, Y.(2002).Triaxial modeling of halo density profiles with high-resolution N-body simulations.ASTROPHYSICAL JOURNAL,574(2),538-553. |
| MLA | Jing, YP,et al."Triaxial modeling of halo density profiles with high-resolution N-body simulations".ASTROPHYSICAL JOURNAL 574.2(2002):538-553. |
入库方式： OAI收割
来源：上海天文台
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